I know you got called a whodev but it's apparent you're not shilling. I really like this game a lot. Reminds me of N+ or some of those other really seemingly simple level editor games.
I love the strange carousel RCT music. Really sets a mood.
Touching the sides of spikes kills you sometimes, but it seems inconsistent.
There's a bug where bullets would bounce off of me as I died and then stay in place (rolling on the ground.) Can't replicate it consistently.
The controls are a bit disorienting at first; I don't like having to change the direction I'm pressing for movement, but that might just be because I'm using keyboard--I feel like it would feel more natural with a joystick.
Lastly I think the "end of level" thing, whatever it's meant to be, should be a different color as well. Maybe blue like the player, or something, so it would stand out more. Because I had no idea that's what I was aiming for.
Anyway, I played all of the levels and the designs are pretty neat. I'll probably play around with the level editor later after I've played more DD games. This is really fun, keep it up!!